import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.GregorianCalendar;

import javax.swing.JFormattedTextField;
import javax.swing.JSpinner;
import javax.swing.SpinnerDateModel;
import javax.swing.text.DateFormatter;
import javax.swing.text.DefaultFormatterFactory;

public class Main {
  public static void main(String[] argv) throws Exception {
    Calendar calendar = new GregorianCalendar();
    calendar.set(Calendar.HOUR_OF_DAY, 13); // 1pm

    SpinnerDateModel dateModel = new SpinnerDateModel(calendar.getTime(), null,
        null, Calendar.HOUR_OF_DAY);
    JSpinner spinner = new JSpinner(dateModel);

    JFormattedTextField tf = ((JSpinner.DefaultEditor) spinner.getEditor()).getTextField();
    DefaultFormatterFactory factory = (DefaultFormatterFactory) tf.getFormatterFactory();
    DateFormatter formatter = (DateFormatter) factory.getDefaultFormatter();

    // Change the date format to only show the hours
    formatter.setFormat(new SimpleDateFormat("hh:00 a"));
    //formatter.setFormat(new SimpleDateFormat("HH:00 a"));
  }
}